Trans/supercritical injection has great potential for improving the formation of combustible gas mixtures and emission performance. In our work, based on the sufficient validation of the current numerical framework, we compared the PR EoS with the RK-PR EoS and applied them to simulate the injection events under trans/supercritical conditions. The effects of different nozzle diameters and chamber conditions on jet characteristics and pseudo-boiling were investigated. The results show that RK-PR EoS has higher prediction accuracy. The nozzle diameter has a significant effect on fuel injection characteristics, and the time required to undergo the pseudo-boiling process becomes longer with increasing nozzle diameter. Compared with chamber temperature, chamber pressure has a greater effect on the fuel breakup. The high pseudo-boiling intensity caused by the low supercritical pressure significantly increases the jet length and reduces the mixing layer thickness. In addition, unlike the single-component case, the occurrence of mixing affects both pseudo-boiling and its intensity.

中文翻译：

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基于广义三次状态方程的跨/超临界燃料喷射数值研究

跨/超临界注入在改善可燃气体混合物的形成和排放性能方面具有巨大潜力。在我们的工作中，基于对当前数值框架的充分验证，我们将 PR EoS 与 RK-PR EoS 进行了比较，并将它们应用于模拟跨/超临界条件下的注入事件。研究了不同喷嘴直径和腔室条件对射流特性和伪沸腾的影响。结果表明RK-PR EoS具有更高的预测精度。喷嘴直径对燃油喷射特性有显着影响，随着喷嘴直径的增大，拟沸腾过程所需的时间变长。与腔室温度相比，腔室压力对燃料破碎的影响更大。由低超临界压力引起的高伪沸腾强度显着增加了射流长度并降低了混合层厚度。此外，与单组分情况不同，混合的发生会影响假沸腾及其强度。